AA 4521 then AA 2685 at Boston
Rochester → Boston → Philadelphia
Timetable, Boston time
06:30AA 4521 from Rochester at the gate
11:21AA 2685 to Philadelphia leaves the gate
4 h 51 apart on the timetable
The last days
AA 4521 and AA 2685 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.